android - alarmmanager 立即启动

Question

我想在每周的午夜设置闹钟这是我的代码:

int notificationId = getNotificationId(); //it get a random number
Context context = rule.context;
Intent intent = ((Activity) context).getIntent();
long time = getRuleCalendar().getTimeInMillis();
AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
PendingIntent pendingIntent = PendingIntent.getBroadcast(context,
     notificationId, intent, PendingIntent.FLAG_UPDATE_CURRENT);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
     alarmManager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, time, pendingIntent);
} else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
     alarmManager.setExact(AlarmManager.RTC_WAKEUP, time,pendingIntent);
} else {
  alarmManager.set(AlarmManager.RTC_WAKEUP, time,pendingIntent);
}

public calendar getRuleCalendar(){
    Calendar calSet = Calendar.getInstance();
    calSet.set(Calendar.DAY_OF_WEEK, calendarDay); //calendarDay change by day of weeks
    calSet.set(Calendar.HOUR_OF_DAY, 0);
    calSet.set(Calendar.MINUTE, 0);
    calSet.set(Calendar.SECOND, 0);
    calSet.set(Calendar.MILLISECOND, 1);
    return calSet
}

现在我的问题是一个闹钟会立即启动(现在是午夜过后，对我来说没问题，我想今天检查一下)，但所有其他闹钟都在错误的时间启动。为什么？

Answer 1

只有在您过去设置闹钟时，闹钟才会立即触发。例如，在您的情况下，您正在为今天的 00:00 AM 设置闹钟，这始终是今天的过去日期。所以你已经设置了第二天 00:00 AM 的闹钟。为此，只需在 Calendar.DAY_OF_YEAR 中添加 1。

 public Calendar getRuleCalendar(){
    Calendar calSet = Calendar.getInstance();
    calSet.set(Calendar.HOUR_OF_DAY, 0);
    calSet.set(Calendar.MINUTE, 0);
    calSet.set(Calendar.SECOND, 0);
    calSet.add(Calendar.DAY_OF_YEAR,1);
    calSet.set(Calendar.MILLISECOND, 1);
    return calSet;
}

以及设置重复警报你必须检查Documentation .

如果您不知道从 android M 开始的 Doze 模式 中的背景行为变化。那么请查看 Optimizing for Doze and App Standby .